Peel, J. S. (1988). Spirellus and related helically coiled microfossils (Cyanobacteria) from the Lower Cambrian of North Greenland. Rapport Grønlands Geologiske Undersøgelse. 137: 5-32.
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Peel, J. S.
1988
Spirellus and related helically coiled microfossils (Cyanobacteria) from the Lower Cambrian of North Greenland
Rapport Grønlands Geologiske Undersøgelse